Cutter head



Nov. 4, 1930. E. s. SHIMER ET AL I CUTTER HEAD Filed June 19, 1928 'aim5 Patented Nov. 4, 1930 TATFAS FFMEUJ ELL-inn s. snrrana Ann nsnonn L.srrnuE-R, or MILTO rnnnsvnvnmn, assmnon TO SAMUEL J. SEIMER- & sons, orMILTQN, 'rnnnsynvanm, A conrozaA'rion or .PE'NNEaYLVANIA CUTTER HEADApplication filed June 19, 1928. Serial at. 286,667.

Our invention relates to an improvement in cutter-heads.

This present invention refers more particularly to that variety ofcutter-heads used for the surfacing of lumber and it applies to planingand matching machines, tenoning machines, shapers, etc., and in fact itwill apply to almost every variety of wood-working and wood-workingmachinery.

The particular feature that we wish to emphasize is the bit-holdingdevice which includes a wedge-shaped block, preferably rounded out orconcaved on its outer surface, thereby serving to turn the chip justunder or beneath the edge of the knife. This block is fitted to achannel of corresponding shape, and a lock-screw or screws, threadedinto it and entering fromthe inner surface of the block, is or areaccessible through a hole in the outer surface to receive a wrenchwhereby the screw or screws are backed off or turned rigidly against thelower surface of the channel, thus forcing the block outwardly againstthe adjacent surface of the knife, forcing the latter rigidly againstthe wall of the channel, where it is held rigidly in place.

In the accompanying drawings: Fig. 1 is a view of a cutter-head inperspective;

Fig. 2 is a transverse section;

Fig. 3 is a view of the several parts of our improved cutter-headdetached and disassembled, but shown in position to be assembled.

The numeral 1 represents a cylindrical cutter-head made of solid metalas is customary. In the particular type illustrated, there are twochannels indicated by the numeral 2 at opposite points. Obviously anynumber of these channels might be employed, and since they are all alikewe shall proceed to refer hereinafter in the singular instead of theplural. The channel has a groove 8 at one side following down and 5forming a continuation of the wall 4 of the channel; and the inner edgeof the knife 5 is seated in the groove 3 and rests against the wall 4,where it is rigidly held by our improved locking and clamping mechanism.

This locking and clamping mechanism consists of a wedge-shaped block 6corresponding in shape with the channel Qand adapted to slide into thelatter endwise where it fits loosely when first inserted.

One or more holes are counterbo-red through the block, and these holesare preferably on two diameters, the hole 7 of larger diameter havingthescrew-threads, and the smaller-bored hole. 8 may be without threads. j

A hollow set-screw 9 is threaded into the, threads of the hole 7 andbeing of greater diameter than the hole 8 can only turn in therestricted space between the bottom of the channel 2 and the shoulder 10formed between the two holes 7 and 8.

The hollow set-screw 9 is reached .by a

hexagonal wrench 11 shown in Fig. 3 through the hole 8, and is receivedby a hexagonal opening 12 in the center of the hollow set screw. Whenthis wrench is turned one way, it will tighten the knife by crowding thewedge-shaped block outwardly against the knife on one side, and thesloping wall 13 of the channel on the other side, by forcing the hollowset-screw inwardly against the inner wall or bottom of the channel '2,and thus making a very simple and rigid lock. Thus a powerful pressureis exerted upon the knife to hold it in place when the cutterhead isrevolving and cutting wood.

When the wrench 11 is turned the opposite 7 way, it will loosen theknife.

The knives are preferably of the thin steel variety known in the tradeas high-speed steel, although any good style will serve the purpose solong as it'is uniform in thickness, and suitable to be subjected to theneeds of the wedge-shaped block. 7

The wedge-shaped block 6 is rounded out or concaved in its outer surfaceas shown at 14 to turn the chip just under or beneath the edge of theknife.

This device has also an advantage of closing up all openings that mayeffect running balance by gum and chips.

We claim: V

A cutter-head of the character described comprising a body portionhaving a channel formed in a side thereof, the walls of said channelconverging toward the periphery,

said channel having an extended groove at a corner thereof, the base ofthechannel being flat and smoothfrom said groove to theopposite sideWall, a knife disposed in said groove, a wedge-shaped block disposed inthe' channel and" having an approximately flat under side to normallyfit against the flat base-of-the channel, said block having ayhole'extending radially therethrough and of two different bores with ashoulder therebetween,

l-the'larger portion of the hole being innermost and screw-threaded, anda' set-screw; threaded into said larger portion and having 7 a recess'toreceive a tool, the inner end of the" set screw being approximately flatto bear against theflat .base ofthe' channel. In testimony whereofWe'aflix our signatures. f H

' r ELMER SQSHIMER.

e HAROLD L1 SHIMER.

